Extragalactic nebula is invisible to the naked eye.
我们用肉眼是河外星系的。
You can see nebulae in the clear summer sky.
在晴朗的夏夜可以天上的星云。
A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.
一粒霉菌是一簇胜收的花朵，一撮星云是无数天体的蚁聚。
As our nebula began to collapse under its own gravity and spin faster, a dense clump of matter formed in the center. It's called a protostar.
当我们的星云在自身用下崩溃和更加快速地旋转时，星云中心形成了密集的物质块。这叫做原恒星。
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This is an emission nebula located just below Orion's belt.
这是位于猎户座星带下方的发射星云。
In a lot of nebulae there's no sharp edge; they just kinda fade away.
在很多星云中并没有尖锐的边缘；它们只是会慢慢消失。
However, this nebula started off more or less as a big shapeless blob.
但是一开始这星云或多或少更像个不成形的水滴。
The orion nebula is a special kind of nebula called a stellar nursery.
猎户座星云是一种特殊星云，叫做恒星摇。
He saw clusters of stars, brightly colored nebulas, even entire galaxies!
他看到了无数星，明亮的星云，甚至还看到了整个银！
These can create lovely sheets, tendrils, and filaments in nebulae as well.
这些也可以在星云中创造出可爱的片状、卷须和丝状物。
That's a very common shape for planetary nebulae.
这是行星状星云很常见的形状。
It is a nebula: a star-forming region where new stars are being born.
一个正在诞生新恒星的恒星形成区域。
The most famous is the Crab nebula, from a star we saw blow up in the year 1054.
其中最著名的是蟹状星云，它来自于我们在1054年看到的恒星爆炸。
Among the other four images were two that showed huge clouds of gas and dust – called nebulas.
在其他四张照片中，有两张展示了巨大的气体和尘埃云——也就是星云。
Orion's sword is home to the great orion nebula, a cloud of dust, hydrogen, helium, and other gases.
猎户剑的位置有猎户座星云，是一种由尘埃、氢气、氦气及其他气体组成的云。
Those elements will spread out to become a nebula, a rich chemical cloud drifting through space.
这些物质最后会扩散开来，形成新的星云，即一大富含化学物质的云飘逸在宇宙之中。
That usually happens when a gas cloud is expanding, like in a planetary nebula or supernova.
这通常发生在气体云膨胀时，比如行星状星云或超新星。
Gas inside a nebula can be in turmoil, too.
星云内的气体也可能处于混乱状态。
The Orion nebula is one of the wonders of the universe.
猎户座星云是宇宙中的奇迹之一。
In Orion, there's a reflection nebula called M 78.
在猎户座中，有一个被称为 M 78 的反射星云。
At the centre of the nebula lies the remnant of the star, its core, crushed by the force of gravity.
在星云的中心处，这颗恒星的星核依然存在着，在引力的作用下它已是面目全非。
Everything we find on the Earth today also originated in that nebula.
我们地球上的一切也都来源于那片星云。
The glow in a planetary nebula is due to the hot central white dwarf exciting the gas.
行星状星云中的光芒是由中央炽热的白矮星激发气体产生的。
This object is what we call a planetary nebula.
这个物体就是我们所说的行星状星云。
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详细解释
河外星系的。
篇 篇 
队长1：复仇者先锋 篇 篇 篇 篇 篇 
用下崩溃和更加快速地旋转时，星云中心形成了密集的物质块。这叫做原恒星。
。
，明亮的星云，甚至还看到了整个银
！
